Many bug fixes and heavy performance improvements

Fixes

• Program crash on multiple effects: Thread-safe openrgb-client version
• Multi-platform support: Correct file separators
• Window is flickering: Update buffering (Experimental)

Performance

• Improve CPU Usage: Less calls to OpenRGB (+ Cache led counts)
• Improve RAM Usage: Newer java version
• Improve GPU Usage: Less window fps

Requirements

• OpenRGB has to be installed
• The SDK Server of OpenRGB has to run on port 6742
• At least java 15.0.1 has to be installed

Special thanks to

• Adam Honse / CalcProgrammer1 - Admin and developer of OpenRGB
• morg / mguimard - Developer of the OpenRGB Java Client